The fifth column1/51/20 2/2401/201/5

The sixth column is1/61/301/6001/5.

If you put it in a standard way, the rules will be obvious.

Cut a line downward with the top11,and the law of the number on the left (which can also include the number just cut) is as follows:

The outermost number is the reciprocal of the number of rows, and the nth row is1/n;

In addition, each number is equal to the number in its upper left corner * the number on its left. For example, 1/6 in the third column is 1/2 on the left side of the second column multiplied by 1/3 on the left side of the third column. And so on. . .

The numbers on the right side of the center line have the opposite law.

1/6 1/(6*5) 1/(6*5*5*4) 1/600 1/30 1/5

1/7 1/(7*6) 1/(7*6)(6*5) 1((7*6)(6*5)(6*5*5*4)。 . . . .